基于Canny算子与色彩信息的仪表读数定位

Region location is the first step of instrument digit recognition. This paper presents the difficult of location (Letters, digits, Chinese characters and punctuators go together; some spots exist on the image; the uneven Illumination also amplifies the difficulties) and introduces three approaches for location, which are edge detection, color information and difference image, based on the water meter features; using the method of dilation instead of the color segment of edge points to improve the location efficiency. The result shows that the color information location has a relative easier condition demanding and a higher speed and would be the final choice.